Fix an implicit cast from const char* (string literal) to char*.

[software/eventxx.git] / eventxx

diff --git a/eventxx b/eventxx
index ce383623865cd8cb3153ff6cc338a4cd056fd3b2..9ac878d488b0f5cc8da37d87147549038af9c325 100644 (file)
--- a/eventxx
+++ b/eventxx
@@ -5,221 +5,6 @@
 #include <stdexcept>   // std::exception, std::invalid_argument,
                        // std::runtime_error, std::bad_alloc
 
 #include <stdexcept>   // std::exception, std::invalid_argument,
                        // std::runtime_error, std::bad_alloc
 

-/** @mainpage
- *
- * @section Introduction
- *
- * The <a href="http://monkey.org/~provos/libevent/">libevent</a> API provides
- * a mechanism to execute a callback function when a specific event occurs on
- * a file descriptor or after a timeout has been reached. Furthermore, libevent
- * also support callbacks due to signals or regular timeouts.
- *
- * libevent is meant to replace the event loop found in event driven network
- * servers. An application just needs to call dispatcher::dispatch() and then
- * add or remove events dynamically without having to change the event loop.
- *
- * Currently, libevent supports /dev/poll, kqueue(2), select(2), poll(2) and
- * epoll(4). It also has experimental support for real-time signals. The
- * internal event mechanism is completely independent of the exposed event API,
- * and a simple update of libevent can provide new functionality without having
- * to redesign the applications. As a result, Libevent allows for portable
- * application development and provides the most scalable event notification
- * mechanism available on an operating system. Libevent should compile on Linux,
- * *BSD, Mac OS X, Solaris and Windows.
- *
- * This is a simple, direct, one-header inline C++ wrapper for libevent. Yes,
- * it's just one header file, so if you want to use it you can just copy the
- * file to your project and you are set.
- *
- * It's designed to be as close to use to libevent (without compromising modern
- * C++ programming techniques) and efficiency (since all implementation is
- * trivial and inline, theoretically, it imposes no overhead at all).
- *
- * Please, visit the <a href="http://www.llucax.com.ar/~luca/eventxx/">eventxx
- * website</a> for the latest documentation.
- *
- * You can always get the <a
- * href="http://www.llucax.com.ar/~luca/eventxx/releases/eventxx.tar.gz">current
- * release</a> from the
- * <a href="http://www.llucax.com.ar/~luca/eventxx/releases/">release
- * directory</a> or grab the
- * <a href="http://www.llucax.com.ar/~luca/repos/eventxx/">most up to date
- * sources</a> from the <a href="http://www.darcs.net/">darcs</a> repository.
- *
- * You can also take a look the the <a
- * href="http://auriga.wearlab.de/~alb/darcsweb/">darcsweb</a> interface to see
- * the <a href="http://www.llucax.com.ar/~luca/repos/darcsweb/?r=eventxx">latest
- * changes online</a> or subscribe to its
- * <a href="http://www.llucax.com.ar/~luca/repos/darcsweb/?r=eventxx;a=rss">RSS
- * feed</a> to follow the development.
- *
- *
- * @section Usage
- *
- * This wrapper was designed to be used just like libevent, but with C++ style
- * syntax sugar (or poison, depends on your point of view ;) and goodies. The
- * main difference to libevent is you always have to instance a
- * eventxx::dispatcher to get an event loop. There is no implicit global event
- * loop. This adds just an extra line of code for single threaded applications
- * and makes things much more simple. See eventxx::dispatcher documentation for
- * more details.
- *
- * You can use use the same plain functions callbacks or the other kind of
- * function objects (see @link events @endlink section for details on event
- * types).
- *
- * eventxx uses @link exceptions @endlink to report errors. All functions has
- * exception specifications, so it's easy to find out what to expect. See
- * exceptions section for more detail.
- *
- * A timespec abstraction is provided in eventxx::time for convenient argument
- * passing. Even more, it's a timespec itself, with some convenient methods for
- * accessing the timespec attributes in a more C++ way. And even more, eventxx
- * is such a direct mapping that all eventxx::event's are libevent event structs
- * too, so theoretically you can pass a eventxx::event to libevent C functions
- * without much trouble. eventxx::dispatcher is the only class that is not
- * derived from libevent struct (event_base) because this struct it's not
- * defined on the libevent header (just declared).
- *
- * Maybe you shouldn't know this implementation details to keep the abstraction,
- * but this is a basic design goal of this wrapper so there is not much chance
- * that this changes in the future (but use this knowledge with care, you are
- * warned ;).
- *
- * @section Example
- *
- * @code
- * #include <eventxx>
- * #include <iostream>
- * #include <csignal>
- *
- * struct handler
- * {
- *     eventxx::dispatcher& d;
- *     int i;
- *     handler(eventxx::dispatcher& d): d(d), i(0) {}
- *     void operator() (int signum, short event)
- *     {
- *             if (i < 5) std::cout << "keep going...\n";
- *             else
- *             {
- *                     std::cout << "done!\n";
- *                     d.exit();
- *             }
- *     }
- * };
- *
- * void sighandler(int signum, short event, void* data)
- * {
- *     int& i = *static_cast< int* >(data);
- *     std::cout << ++i << " interrupts, ";
- * }
- *
- * int main()
- * {
- *     eventxx::dispatcher d;
- *     handler h(d);
- *     eventxx::csignal sigev(SIGINT, sighandler, &h.i);
- *     eventxx::signal< handler > e(SIGINT, h);
- *     d.add(sigev);
- *     d.add(e);
- *     d.dispatch();
- *     return 0;
- * }
- * @endcode
- *
- * You can see some more examples on the test directory of the distribution or
- * on the examples related page.
- *
- *
- * @section Status
- *
- * This library was not widely used yet, it lack some testing. Because templates
- * are not even compiled when they are used, you can't be surprised if you catch
- * a piece of code that didn't got even compiled yet because the lack of
- * testing. The library has no support for buffered events yet either. It
- * doesn't support the http stuff, and probably never will because that has
- * nothing to do with event handling.
- *
- * If you notice this lib leaks memory, don't blame me, blame libevent :)
- * libevent has a known bug on event_base_free() that makes it assert always, so
- * event_base_free() it's unusable, unless you patch your libevent (for example,
- * using this <a
- * href="http://monkeymail.org/archives/libevent-users/2006-April/000141.html">patch</a>
- * written by Mark D. Anderson and who knows why it's not still applied. If you
- * do so, you can compile your programs with -DEVENT_BASE_FREE_FIX so
- * event_base_free() gets called.
- *
- * That said, I think it's pretty usable anyways. If something is broken it
- * would be really easy to fix it because is just a simple wrapper around
- * libevent. So, please try it out, and if you have any problems,
- * <a href="mailto:llucax+eventxx@gmail.com">drop me an
- * e-mail</a> and and I'll fix it ASAP (or provide a patch and you will be my
- * best friend ;).
- *
- * Patches to support buffered events are welcome too.
- *
- *
- * @author Leandro Lucarella <llucax+eventxx@gmail.com>
- *
- * @version 0.1
- *
- * @par License
- * This program is under the BOLA license (see
- * http://auriga.wearlab.de/~alb/bola/ for more info or the
- * <a href="http://www.llucax.com.ar/~luca/repos/eventxx/LICENSE">LICENSE</a>
- * file itself).
- *
- */
-
-/** @example c-way.cpp
- *
- * This is a simple example illustrating the usage with C-like callback
- * functions.
- */
-
-/** @example functor-way.cpp
- *
- * This is a simple example illustrating the usage with function object
- * callbacks.
- */
-
-/** @example mixed-way.cpp
- *
- * This is a simple example illustrating the usage with a mix of C-like callbacks
- * and function object callbacks.
- */
-
-/** @example bench.cpp
- *
- * This is a benchmark example, extracted from libevent and ported to eventxx.
- */
-
-/** @example prio-test.cpp
- *
- * This is a priority usage example.
- */
-
-/** @example test-time.cpp
- *
- * This is a timer usage example ported from libevent.
- */
-
-/** @example test-eof.cpp
- *
- * This is some kind of test of EOF ported from libevent.
- */
-
-/** @example test-weof.cpp
- *
- * Another test of EOF ported from libevent.
- */
-
-/** @example trivial.cpp
- *
- * This is the most trivial example.
- */
-

 /**
  * Namespace for all symbols libevent C++ wrapper defines.
  */
 /**
  * Namespace for all symbols libevent C++ wrapper defines.
  */


@@ -317,10 +102,6 @@ enum
 };
 
 
 };
 
 

-/// C function used as callback in the C API.
-typedef void (*ccallback_type)(int, short, void*);
-
-

 /**
  * Time used for timeout values.
  *
 /**
  * Time used for timeout values.
  *


@@ -377,6 +158,12 @@ struct time: ::timeval
  * function objects (see eventxx::event, eventxx::timer and eventxx::signal
  * templates). The former are just typedef'ed specialization of the later.
  *
  * function objects (see eventxx::event, eventxx::timer and eventxx::signal
  * templates). The former are just typedef'ed specialization of the later.
  *

+ * A member function wrapper functor (eventxx::mem_cb) is also included,
+ * so you can use any member function (method) as an event handler.
+ *
+ * Please note that C-like function callback take a short as the type of event,
+ * while functors (or member functions) use eventxx::type.
+ *

  * All events derive from a plain class (not template) eventxx::basic_event, one
  * of the main utilities of it (besides containing common code ;) is to be used
  * in STL containers.
  * All events derive from a plain class (not template) eventxx::basic_event, one
  * of the main utilities of it (besides containing common code ;) is to be used
  * in STL containers.


@@ -385,6 +172,11 @@ struct time: ::timeval
  */
 //@{
 
  */
 //@{
 

+
+/// C function used as callback in the C API.
+typedef void (*ccallback_type)(int, short, void*);
+
+

 /**
  * Type of events.
  *
 /**
  * Type of events.
  *


@@ -405,6 +197,14 @@ enum type
        PERSIST = EV_PERSIST  ///< Not really an event, is an event modifier.
 };
 
        PERSIST = EV_PERSIST  ///< Not really an event, is an event modifier.
 };
 

+inline
+type operator| (const type& t1, const type& t2)
+{
+       int r = static_cast< int >(t1) | static_cast< int >(t2);
+       return *reinterpret_cast< type* >(&r);
+}
+
+

 /**
  * Basic event from which all events derive.
  *
 /**
  * Basic event from which all events derive.
  *


@@ -491,8 +291,8 @@ struct basic_event: internal::event
  * an integer (the file descriptor of the fired event) and an event::type (the
  * type of event being fired).
  * There is a specialized version of this class which takes as the template
  * an integer (the file descriptor of the fired event) and an event::type (the
  * type of event being fired).
  * There is a specialized version of this class which takes as the template

- * parameter a C function with the ccallback_type signature, just like C
- * libevent API does.
+ * parameter a C function with the eventxx::ccallback_type signature, just like
+ * C @libevent API does.

  *
  * @see eventxx::event< ccallback_type >
  */
  *
  * @see eventxx::event< ccallback_type >
  */


@@ -507,9 +307,9 @@ struct event: basic_event
         * @param ev Type of events to monitor (see eventxx::type).
         * @param handler Callback functor.
         */
         * @param ev Type of events to monitor (see eventxx::type).
         * @param handler Callback functor.
         */

-       event(int fd, short ev, F& handler) throw()
+       event(int fd, type ev, F& handler) throw()

        {
        {

-               event_set(this, fd, ev, &wrapper,
+               event_set(this, fd, static_cast< short >(ev), &wrapper,

                                reinterpret_cast< void* >(&handler));
        }
 
                                reinterpret_cast< void* >(&handler));
        }
 


@@ -543,9 +343,9 @@ struct event< ccallback_type >: basic_event
         * @param handler C-style callback function.
         * @param arg Arbitrary pointer to pass to the handler as argument.
         */
         * @param handler C-style callback function.
         * @param arg Arbitrary pointer to pass to the handler as argument.
         */

-       event(int fd, short ev, ccallback_type handler, void* arg) throw()
+       event(int fd, type ev, ccallback_type handler, void* arg = 0) throw()

        {
        {

-               event_set(this, fd, ev, handler, arg);
+               event_set(this, fd, static_cast< short >(ev), handler, arg);

        }
 
        protected:
        }
 
        protected:


@@ -600,7 +400,7 @@ struct timer< ccallback_type >: event< ccallback_type >
         * @param handler C-style callback function.
         * @param arg Arbitrary pointer to pass to the handler as argument.
         */
         * @param handler C-style callback function.
         * @param arg Arbitrary pointer to pass to the handler as argument.
         */

-       timer(ccallback_type handler, void* arg) throw()
+       timer(ccallback_type handler, void* arg = 0) throw()

        {
                evtimer_set(this, handler, arg);
        }
        {
                evtimer_set(this, handler, arg);
        }


@@ -666,7 +466,7 @@ struct signal< ccallback_type >: event< ccallback_type >
         * @param handler C-style callback function.
         * @param arg Arbitrary pointer to pass to the handler as argument.
         */
         * @param handler C-style callback function.
         * @param arg Arbitrary pointer to pass to the handler as argument.
         */

-       signal(int signum, ccallback_type handler, void* arg) throw()
+       signal(int signum, ccallback_type handler, void* arg = 0) throw()

        {
                signal_set(this, signum, handler, arg);
        }
        {
                signal_set(this, signum, handler, arg);
        }


@@ -693,6 +493,41 @@ typedef eventxx::timer< ccallback_type > ctimer;
 /// Shortcut to C-style signal handler.
 typedef eventxx::signal< ccallback_type > csignal;
 
 /// Shortcut to C-style signal handler.
 typedef eventxx::signal< ccallback_type > csignal;
 

+/**
+ * Helper functor to use an arbitrary member function as an event handler.
+ *
+ * With this wrapper, you can use any object method, which accepts the right
+ * parameters (int, short) and returns void, as an event handler. This way you
+ * don't have to overload the operator() which can be confusing depending on the
+ * context.
+ *
+ * You can see an usage example in the Examples Section.
+ */
+template < typename O, typename M >
+struct mem_cb
+{
+
+       /**
+        * Member function callback constructor.
+        *
+        * It expects to receive a class as the first parameter (O), and a
+        * member function (of that class O) as the second parameter.
+        *
+        * When this instance is called with fd and ev as function arguments,
+        * object.method(fd, ev) will be called.
+        *
+        * @param object Object to be used.
+        * @param method Method to be called.
+        */
+       mem_cb(O& object, M method) throw():
+               _object(object), _method(method) {}
+
+       void operator() (int fd, type ev) { (_object.*_method)(fd, ev); }
+       protected:
+               O& _object;
+               M _method;
+
+}; // struct mem_cb

 
 //@}
 
 
 //@}
 


@@ -721,7 +556,8 @@ struct dispatcher
         */
        dispatcher() throw()
        {
         */
        dispatcher() throw()
        {

-               _event_base = static_cast< internal::event_base* >(internal::event_init());
+               _event_base = static_cast< internal::event_base* >(
+                               internal::event_init());

        }
 
        /**
        }
 
        /**


@@ -731,16 +567,16 @@ struct dispatcher
         */
        dispatcher(int npriorities) throw(std::bad_alloc)
        {
         */
        dispatcher(int npriorities) throw(std::bad_alloc)
        {

-               _event_base = static_cast< internal::event_base* >(internal::event_init());
+               _event_base = static_cast< internal::event_base* >(
+                               internal::event_init());

                if (!_event_base) throw std::bad_alloc();
                // Can't fail because there is no way that it has active events
                internal::event_base_priority_init(_event_base, npriorities);
        }
 
                if (!_event_base) throw std::bad_alloc();
                // Can't fail because there is no way that it has active events
                internal::event_base_priority_init(_event_base, npriorities);
        }
 

-#ifdef EVENT_BASE_FREE_FIX
+#ifndef EVENTXX_NO_EVENT_BASE_FREE
+       /// Free dispatcher resources, see @ref Status section for details.

        ~dispatcher() throw() { event_base_free(_event_base); }
        ~dispatcher() throw() { event_base_free(_event_base); }

-#else
-#warning "The dispatcher class *will* leak memory because of a libevent bug, see http://www.mail-archive.com/libevent-users@monkey.org/msg00110.html for more info an a patch. If you already have this patch, please -DEVENT_BASE_FREE_FIX to your compiler to make this message disappear and really free the dispatcher memory using event_base_free()."

 #endif
 
        /**
 #endif
 
        /**


@@ -777,7 +613,8 @@ struct dispatcher
                if (priority != DEFAULT_PRIORITY
                                && internal::event_priority_set(&e, priority))
                        throw invalid_priority();
                if (priority != DEFAULT_PRIORITY
                                && internal::event_priority_set(&e, priority))
                        throw invalid_priority();

-               internal::event_add(&e, const_cast< time* >(&to)); // XXX HACK libevent don't use const
+               // XXX HACK libevent don't use const
+               internal::event_add(&e, const_cast< time* >(&to));

        }
 
        /**
        }
 
        /**


@@ -793,8 +630,9 @@ struct dispatcher
        template < typename F >
        void add_once(int fd, type ev, F& handler)
        {
        template < typename F >
        void add_once(int fd, type ev, F& handler)
        {

-               internal::event_once(fd, ev, &dispatcher::wrapper< F >,
-                               reinterpret_cast< void* >(&handler), 0);
+               internal::event_once(fd, static_cast< short>(ev),
+                       &dispatcher::wrapper< F >,
+                       reinterpret_cast< void* >(&handler), 0);

        }
 
        /**
        }
 
        /**


@@ -810,7 +648,8 @@ struct dispatcher
         */
        void add_once(int fd, type ev, ccallback_type handler, void* arg)
        {
         */
        void add_once(int fd, type ev, ccallback_type handler, void* arg)
        {

-               internal::event_once(fd, ev, handler, arg, 0);
+               internal::event_once(fd, static_cast< short >(ev), handler,
+                       arg, 0);

        }
 
        /**
        }
 
        /**


@@ -827,9 +666,11 @@ struct dispatcher
        template < typename F >
        void add_once(int fd, type ev, F& handler, const time& to)
        {
        template < typename F >
        void add_once(int fd, type ev, F& handler, const time& to)
        {

-               internal::event_once(fd, ev, &dispatcher::wrapper< F >,
-                               reinterpret_cast< void* >(&handler),
-                               const_cast< time* >(&to)); // XXX HACK libevent don't use const
+               internal::event_once(fd, static_cast< short >(ev),
+                       &dispatcher::wrapper< F >,
+                       reinterpret_cast< void* >(&handler),
+                       // XXX HACK libevent don't use const
+                       const_cast< time* >(&to));

        }
 
        /**
        }
 
        /**


@@ -844,9 +685,12 @@ struct dispatcher
         * @param arg Arbitrary pointer to pass to the handler as argument.
         * @param to Timeout.
         */
         * @param arg Arbitrary pointer to pass to the handler as argument.
         * @param to Timeout.
         */

-       void add_once(int fd, type ev, ccallback_type handler, void* arg, const time& to)
+       void add_once(int fd, type ev, ccallback_type handler, void* arg,
+                       const time& to)

        {
        {

-               internal::event_once(fd, ev, handler, arg, const_cast< time* >(&to)); // XXX HACK libevent don't use const
+               internal::event_once(fd, static_cast< short >(ev), handler, arg,
+                               // XXX HACK libevent don't use const
+                               const_cast< time* >(&to));

        }
 
        /**
        }
 
        /**


@@ -863,7 +707,8 @@ struct dispatcher
        {
                internal::event_once(-1, EV_TIMEOUT, &dispatcher::wrapper< F >,
                                reinterpret_cast< void* >(&handler),
        {
                internal::event_once(-1, EV_TIMEOUT, &dispatcher::wrapper< F >,
                                reinterpret_cast< void* >(&handler),

-                               const_cast< time* >(&to)); // XXX HACK libevent don't use const
+                               // XXX HACK libevent don't use const
+                               const_cast< time* >(&to));

        }
 
        /**
        }
 
        /**


@@ -878,7 +723,9 @@ struct dispatcher
         */
        void add_once_timer(ccallback_type handler, void* arg, const time& to)
        {
         */
        void add_once_timer(ccallback_type handler, void* arg, const time& to)
        {

-               internal::event_once(-1, EV_TIMEOUT, handler, arg, const_cast< time* >(&to)); // XXX HACK libevent don't use const
+               // XXX HACK libevent don't use const
+               internal::event_once(-1, EV_TIMEOUT, handler, arg,
+                               const_cast< time* >(&to));

        }
 
        /**
        }
 
        /**


@@ -908,8 +755,13 @@ struct dispatcher
         * @param flags If eventxx::ONCE is specified, then just one event is
         *              processed, if eventxx::NONBLOCK is specified, then this
         *              function returns even if there are no pending events.
         * @param flags If eventxx::ONCE is specified, then just one event is
         *              processed, if eventxx::NONBLOCK is specified, then this
         *              function returns even if there are no pending events.

+        *
+        * @return 0 if eventxx::NONBLOCK or eventxx::ONCE is set, 1 if there
+        *         are no more events registered and EINTR if you use the
+        *         @libevent's  @c event_gotsig and return -1 in your
+        *         @c event_sigcb callback.

         */
         */

-       int dispatch(int flags = 0) // TODO  throw(exception)
+       int dispatch(int flags = 0) throw()

        {
                return internal::event_base_loop(_event_base, flags);
        }
        {
                return internal::event_base_loop(_event_base, flags);
        }


@@ -919,8 +771,11 @@ struct dispatcher
         *
         * @param to If a timeout is given, the loop exits after the specified
         *           time is elapsed.
         *
         * @param to If a timeout is given, the loop exits after the specified
         *           time is elapsed.

+        *
+        * @return Not very well specified by @libevent :-/ that's why it
+        *         doesn't throw an exception either.

         */
         */

-       int exit(const time& to = time())
+       int exit(const time& to = time()) throw() // TODO  throw(exception)

        {
                // XXX HACK libevent don't use const
                return internal::event_base_loopexit(_event_base,
        {
                // XXX HACK libevent don't use const
                return internal::event_base_loopexit(_event_base,


@@ -930,7 +785,7 @@ struct dispatcher
        protected:
                internal::event_base* _event_base;
                template < typename F >
        protected:
                internal::event_base* _event_base;
                template < typename F >

-               static void wrapper(int fd, type ev, void* h)
+               static void wrapper(int fd, short ev, void* h)

                {
                        F& handler = *reinterpret_cast< F* >(h);
                        handler(fd, *reinterpret_cast< type* >(&ev));
                {
                        F& handler = *reinterpret_cast< F* >(h);
                        handler(fd, *reinterpret_cast< type* >(&ev));


@@ -938,8 +793,7 @@ struct dispatcher
 
 }; // struct dispatcher
 
 
 }; // struct dispatcher
 

-
-} // namespace event
+} // namespace eventxx

 
 #endif // _EVENTXX_HPP_
 
 
 #endif // _EVENTXX_HPP_